Thames & Kosmos Hot Ice Crystals handleiding

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Thames & Kosmos

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Handleiding

Label the clean measuring cup

with “sodium acetate solution,”

using a piece of paper and a

pencil and then afﬁxing the label

to the outside of the cup with a

strip of tape.

Remove the pot from the burner

just before it comes to a boil, set

it on the trivet, and place the

jar with the crystal salt in the

hot water bath. Be careful not

to burn yourself! Stir with the

wooden spatula until the crystals

are completely dissolved in the

liquid.

Slowly pour the solution into the

labeled measuring cup, cover the

cup with the jelly jar lid, and let it

cool overnight in an undisturbed,

out-of-the way location. Now you

can start growing crystals!

Continue to Experiment 2.

GEEK

OUT!

WHAT’S HAPPENING?

Sodium acetate, the sodium salt of acetic acid, looks

like coarse sugar and has a slight vinegary odor. It is non-toxic

and is used in a lot of foods as a preservative. The crystal salt

dissolves completely in the hot water bath. Just a small amount

of liquid is enough, since the sodium acetate crystals store

water inside themselves. At 58 °C, they release their water of

crystallization and “melt,” yielding a clear, colorless solution.

If you let the solution cool, it becomes supersaturated. That

means that the heating dissolved a lot more crystal salt than

you would have been able to stir into cold water.

Krystal

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